• Allium reports $482 billion of stablecoin payments through September 2026, up 45% year over year, while supply was about $305 billion at the end of September, up 0.4% since the start of the year.
• The payments figure is a filtered subset: Allium says about 2.5% of $97.9 trillion in raw transfers, or $2.4 trillion, remains after its filters, and payments are roughly one-fifth of that adjusted volume.
• Allium puts stablecoin card spend at $3.9 billion, about ten times the prior year, but its page does not state the period explicitly, so it should not be compared with network-wide volumes.
• Visa said on October 15, 2026 that stablecoin prefunding in Visa Direct has moved from pilot to commercial deployment, with Inyo Global as the first enabler.
• For merchants and fintechs, the practical question is who holds the balance, who sets the conversion rate, and what fee applies at each step.

Stablecoin payments are rising quickly even though the amount of stablecoin in circulation is barely moving. Allium's Q3 2026 report puts payments at $482 billion through September 2026, up 45% from a year earlier, while supply stood at about $305 billion at the end of September, up 0.4% since January. The growth is in usage, and recent launches from Mastercard and Visa show where the card networks want that usage to settle.

The 45% figure is a filtered slice of a much larger flow

The headline growth rate applies to a deliberately narrow measure. Allium reports raw stablecoin transfers of $97.9 trillion through September, of which about 2.5%, or $2.4 trillion, remains after its filters. Payments make up roughly one-fifth of that adjusted volume. The $482 billion is therefore an analyst's classification, not a settled count, and the filtering rules drive the result. The payment count rose 71% to 1.04 billion, while the average payment fell from $544 to $462.

Card spending is growing fast from a small base

Allium reports stablecoin card spend growing ten times to $3.9 billion. Its page does not state the period for that figure explicitly, so it cannot be set against the annual or quarterly volumes of the card networks without risking a false ratio. The sound reading is narrower: tenfold growth from a small base says more about issuer programs launching than about merchants changing how they accept payment, and the absolute size remains modest.

Mastercard is packaging stablecoins as one more account type

Mastercard and BVNK describe the Global Money Platform as a single connection for multi-currency accounts holding fiat and stablecoins, real-time conversion, stablecoin-linked cards and local bank payouts, according to Mastercard's release. Nuvei and Marqeta are named among the first integrators. The strategic point is that conversion and payout, where fees are typically earned, can stay inside a network the incumbent already operates, rather than moving to a separate crypto-native venue.

Visa and Stripe are attacking the same settlement gap

Visa said on October 15, 2026 that stablecoin prefunding in Visa Direct has moved from pilot to commercial deployment. Inyo Global is the first enabler, letting eligible businesses prefund cross-border payouts with USDC in near real time instead of relying only on traditional funding windows. Visa says availability depends on eligibility and geography. CoinDesk separately reports that Stripe and Plasma are co-developing a multi-currency card; that detail rests on CoinDesk's reporting here.

What this means for merchants and fintech operators

The practical consequence is a pricing question rather than a technology one. If stablecoins enter through network-run platforms, merchants and fintechs may pay conversion and payout fees to the network instead of bypassing intermediaries. That is an inference, not a reported outcome. Operators evaluating these rails should ask who holds the balance, who sets the conversion rate, and which jurisdictions each payout covers. Watch whether Allium's filtered payments keep outgrowing supply, and whether card spend is reported with a clear period.